<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
		#d1:before{
			content: '上午好，';
		}
			#d1:after{
				content: '我是渣渣灰';
				color: red;
			}
		</style>
	</head>
	<body>
		<div id="d1">
			大家好，
		</div>
	</body>
</html>
